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PERFORMANCE Incorrect idle mixture setting Reset idle mixture, see ENGINE PERFORMANCE Faulty Acceleration Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Engine cold and choke too lean Adjust choke and allow engine to warm-up Defective spark plugs Replace spark plugs Defective coil Replace coil Faulty Low Speed Operation Clogged idle transfer slots Clean idle transfer slots, see FUEL Restricted idle air bleeds and Disassemble and clean carburetor, see FUEL Clogged air cleaner Replace air filter Defective spark plugs Replace spark plugs Defective ignition wires Replace ignition wire see ENGINE PERFORMANCE Defective distributor cap Replace distributor cap Faulty High Speed Operation Incorrect ignition timing Reset ignition timing see ENGINE PERFORMANCE Defective distributor centrifugal Replace advance mechanism Defective distributor vacuum Replace advance unit Incorrect spark plugs or plug gap Check gap and/or replace spark plugs Faulty choke operation Check choke and repair as required Clogged vacuum passages Remove restrictions Improper size or clogged main jet Check jet size and clean, see FUEL Restricted air cleaner Check filter and replace as necessary Defective distributor cap, rotor or Replace cap, rotor or coil Misfire at All Speeds Defective spark plugs Replace spark plugs Defective spark plug wires Replace spark plug wires Defective distributor cap, rotor, or Replace cap, rotor, or coil Cracked or broken vacuum hoses Replace vacuum hoses Vacuum leaks Repair vacuum leaks Fuel lines clogged Remove restriction
1998 Chevrolet Pickup C1500 GENERAL INFORMATION Trouble Shooting - Basic Procedures
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